Hey there, just curious what progress was made so far? I did quite a bit of CAN bus hacking with my BMW, and integrated a DIY Android tablet interface so that I could retain my factory integrations and more. While attaining accurate readings for battery upgrades are important, I think the larger target audience will be aftermarket head unit upgrades. On my BMW android integration, I was also able to build a custom alarm system, with included camera, motion sensor, and text alerts. I made it into a full TCU of sorts and much more. I was also able to remotely control all functionality such as lighting, windows, convertible top, etc. all through powerful software known as Droidscript, which has native USB FTDI OTG to serial support. Definitely consider Android, since power saving features (including built in battery) is an option. Once the floodgates are open here, I think you’d be surprised how many would want to upgrade their factory head units.
Here’s a simple video of it:https://www.youtube.com/watch?v=oVbacAOghNM